The island arc has been worse about it because of the shear number of love interests that have been introduced. The pirate arc had like 3 love interests and Pearl didn't get her first scene until the start of this one and the mc was still focused on his goal the whole time of getting the chalice. It wasn't just rapid filler sex scenes the whole time. The later arc with the princess was the same. There was a few filler sex scenes, but It never really felt like those scenes got in the way of progressing to the plot or that the plot was being sidelined for those scenes.
Yeah, i think this dreadful island arc has doubled the LI's, if not more... pretty much all of them are one dimensional and forgettable. It's so fucking boring and constantly filler and more pointles sex scenes. The lovey dovey talk is really annoying, like dude i can't hear it anymore, just same bs to every single of the dozen new girls...
I genuinely hope after the island arc is done the island with all the girls sinks to the ground of the sea and is never to be heard of again.
I'd hope the dev is focusing on the main LI's and a couple of the existing ones in the capital when back and most important, the story and not introducing more girls...but this whole arc let me really doubt it.